HI I need help with the steps in between? I am totally confused...
So, how to derive the final equation from equation 1 and 2
m1v1i+m2v2i=m1v1+m2v2f (Equation 1)
1/2m1V1i^2+1/2m2v2i^2=1/2m1v1f^2+1/2m2v2f^2 (Equation 2)
v1i-v2i= -(V1f-v2f) ( Final Equation)